package com.saturday.consumer.controller;

import com.saturday.consumer.domain.Goods;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.List;

/**
 * @author :Lx
 * @Date :2021/1/22 0022 20:10
 * @Description：RestTemplate远程调用
 */
@RestController
@RequestMapping("/order")
public class OrderController {

    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    private DiscoveryClient discoveryClient;

    @GetMapping("/goods/{id}")
    public Goods findGoodsById(@PathVariable("id") int id) {

        /**
         *  远程调用Goods服务中的findOne接口
         *
         *  restTemplate缺点：URL写死了
         */

        /**
         * 动态从Eureka Server 中获取 provider 的 ip 和端口
         *          1. 注入 DiscoveryClient 对象.激活
         *          2. 调用方法
         */


        List<ServiceInstance> instances = discoveryClient.getInstances("consul-provider");
        //判断集合是否有数据
        if(instances == null || instances.size() == 0){
            //集合没有数据
            return null;
        }
        ServiceInstance instance = instances.get(0);
        String host = instance.getHost();
        int port = instance.getPort();
        String url = "http://"+host+":"+port+"/goods/findOne/"+id;
        //调用方法
        Goods goods = restTemplate.getForObject(url, Goods.class);
        return goods;
    }
}
